In modern society, humans and beastmen live together. Under strict government management, beastmen have become cogs in the social machine, utilizing their extraordinary physical abilities and senses in highly specialized professions.

However, there are those who fall out of those gears and exist in opposition to society.

Standing at the front lines against them is the Metropolitan Police Department's Special Incident Response Division, the "Special Division." There, "beastman detectives" with extraordinary intuition and "human detectives" who tame them and act as brakes form pairs to tackle various special crimes.

Guest was running through a crime scene today, aiming to solve a case alongside their partner.

And today, they had handled a case involving Sangakai and successfully resolved it—

—or so they thought.